pkalogiros/audiomass ? reverse-engineered prompt

Build me a web app like AudioMass, a free browser based audio and waveform editor that I can open locally in my browser. It should let me load an audio file, see the waveform, zoom and scrub around, cut and edit audio, and use a full multitrack mode with multiple layers, dragging clips around, crossfading overlaps, recording onto armed tracks, and exporting or bouncing everything back into one file.

I want it to run from a simple local server so I can just start it and go to localhost in the browser. Make the interface feel polished and easy to use, with the main editing tools, track controls, and a clear timeline. If you need current details for any browser audio features, look up the latest docs online.